Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Direct Financing Leases (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Direct Financing Leases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Residual Value of Leased Asset $ 96  
Capital Leases, Future Minimum Payments Receivable, Next Twelve Months 600  
Capital Leases, Future Minimum Payments, Receivable in Two Years 500  
Capital Leases, Future Minimum Payments, Receivable in Three Years 300  
Capital Leases, Future Minimum Payments, Receivable in Four Years 200  
Capital Leases, Future Minimum Payments, Receivable in Five Years 100  
Capital Leases, Future Minimum Payments, Receivable Thereafter 100  
Direct Financing Lease, Interest Income 26  
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received 1,727 $ 1,747
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property 717 726
Capital Leases Gross Investment In Direct Financing Leases 2,444 2,473
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs 19 20
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income 250 250
Capital Leases, Net Investment in Direct Financing Leases $ 2,213 $ 2,243